Between the battle of the Tyra system and Operation Return, a large operation called the "Bolian Operation" also took place. It is unknown if this was a battle or something else, though many lives hung in the balance.

A few vaguely referenced incidents might also qualify. "The Visitor" showed hostilities between the Federation and the Klingon empire, and while war was not mentioned, these seemed serious enough that Starfleet was forced to hand over control of Deep Space 9. Given Janeway's confidence, her assertion that the Borg are no longer a threat to the Federation in "Endgame" might have been proven in combat. The same episode also mentioned a seemingly serious conflict between Voyager and the Fen Domar. "Shockwave" showed a future where Earth was in ruins, but did not specify if this was the result of direct conflict.

A number of unspecified conquests seem to have taken place also. Between 2063 and 2155, Earth had conquered the Vulcans and the Gorlans, and seemingly at least partially conquered or enslaved the Andorians, Tellarites, Denobulans, and Orions, as well as some unidentified species.

In 2372 Garak attempted an unauthorised orbital bombardment of the Founders' homeworld using the USS Defiant. He was caught. (DS9: "Broken Link")

Shortly before the [[Federation-Klingon War (2372-73)|Federation-Klingon War]], representatives of Federation worlds along the Klingon unsuccessfully called for a Federation preemptive strike. (DS9: "Broken Link")

After the USS Enterprise was attacked (and managed to evade) Ekosian missiles in 2268, the Ekosian government spinned this event as the successful defeat of an attack by multiple Zeon spacecraft. (TOS: "Patterns of Force")

In 2368, Romulan admiral Alidar Jarokdefected to the Federation with information that a Romulan invasion of Federation space was being prepared. However, the admiral had been fed false intelligence to test his loyalty. (TNG: "The Defector")

When taken together, The short life expectancies of Jem'Hadar, together with the fact that very few don't die in battle, would suggest that the Dominion is constantly involved in conflict, even beyond those seen on-screen.

A number of species were said to have once been warlike, even if no specific conflicts were named.

Argelius II was very violent before its Great Awakening. It is unknown if this violence extended to armed conflict. Skorr can similary be assumed to have been involved in many conflicts before their awakening.

Ekosians were a said to be a warlike people until at least a few years before 2268.